mutualism

definition: 
Symbiosis which is beneficial to both organisms involved.
sentence: 
One of the best-known forms of mutualism involves insects that pollinate a host plant, then deposit offspring that will ultimately consume many of the seeds. The presence of a commensal parasite that can display mutualism within a clade of known pathogens suggests dynamic evolutionary interactions.
difficulty: 
easy
toefl frequency: 
2
toefl classification: